A hydrosilylation curable composition includes a new 2-substituted-1-alkynyl-1-cyclohexanol as an inhibitor. The hydrosilylation curable composition is useful for preparing release coatings for packaging applications.

A hydrosilylation curable composition includes a new 2-substituted-1-alkynyl-1-cyclohexanol as an inhibitor. The hydrosilylation curable composition is useful for preparing release coatings for packaging applications.

A process for purifying a crude composition includes a monoterpene compound selected from the group consisting of monocyclic monoterpene alcohols, monocyclic monoterpene ketones, bicyclic epoxy monoterpenes and mixtures of two or more of the aforementioned compounds, such as preferably a monocyclic monoterpene alcohol. The process comprises performing a layer crystallization with a melt of the crude composition, and the melt of the crude composition subjected to the layer crystallization includes oxygen-containing solvent in a concentration of 20 ppm to 2% by weight. The oxygen-containing solvent is selected from the group consisting of water, C1-6-alcohols, C1-6-carboxylic acids, C1-6-ketones, C1-6-aldehydes, C1-12-ethers, C1-12-esters and mixtures of two or more of the aforementioned solvents.

A process for purifying a crude composition includes a monoterpene compound selected from the group consisting of monocyclic monoterpene alcohols, monocyclic monoterpene ketones, bicyclic epoxy monoterpenes and mixtures of two or more of the aforementioned compounds, such as preferably a monocyclic monoterpene alcohol. The process comprises performing a layer crystallization with a melt of the crude composition, and the melt of the crude composition subjected to the layer crystallization includes oxygen-containing solvent in a concentration of 20 ppm to 2% by weight. The oxygen-containing solvent is selected from the group consisting of water, C1-6-alcohols, C1-6-carboxylic acids, C1-6-ketones, C1-6-aldehydes, C1-12-ethers, C1-12-esters and mixtures of two or more of the aforementioned solvents.

A process for purifying a crude composition includes a monoterpene compound selected from the group consisting of monocyclic monoterpene alcohols, monocyclic monoterpene ketones, bicyclic epoxy monoterpenes and mixtures of two or more of the aforementioned compounds, such as preferably a monocyclic monoterpene alcohol. The process comprises performing a layer crystallization with a melt of the crude composition, and the melt of the crude composition subjected to the layer crystallization includes oxygen-containing solvent in a concentration of 20 ppm to 2% by weight. The oxygen-containing solvent is selected from the group consisting of water, C1-6-alcohols, C1-6-carboxylic acids, C1-6-ketones, C1-6-aidehydes, C1-12-ethers, C1-12-esters and mixtures of two or more of the aforementioned solvents.

A process for purifying a crude composition includes a monoterpene compound selected from the group consisting of monocyclic monoterpene alcohols, monocyclic monoterpene ketones, bicyclic epoxy monoterpenes and mixtures of two or more of the aforementioned compounds, such as preferably a monocyclic monoterpene alcohol. The process comprises performing a layer crystallization with a melt of the crude composition, and the melt of the crude composition subjected to the layer crystallization includes oxygen-containing solvent in a concentration of 20 ppm to 2% by weight. The oxygen-containing solvent is selected from the group consisting of water, C1-6-alcohols, C1-6-carboxylic acids, C1-6-ketones, C1-6-aidehydes, C1-12-ethers, C1-12-esters and mixtures of two or more of the aforementioned solvents.

The present invention relates to a process for enriching enantiomers from an enantiomer mixture by a fractionating melt crystallization in a melt crystallization apparatus. The invention specifically relates to a process for producing an enantiomer-enriched chiral terpene, in particular of D/L-Isopulegol. The process comprises: i) a crystallization step to obtain a crystallizate and a mother melt and removal of the mother melt from the crystallizate to afford a mother melt fraction; ii) sweating of the crystallizate obtained in step i) to afford a molten sweating fraction and iii) subsequent melting of the sweated crystallizate to afford a molten crystallizate fraction,
wherein the optical rotation at least of the sweating fraction is determined online using a polarimeter and the changeover from step ii) to step iii) is controlled online by means of at least one control unit.

The present invention relates to a process for enriching enantiomers from an enantiomer mixture by a fractionating melt crystallization in a melt crystallization apparatus. The invention specifically relates to a process for producing an enantiomer-enriched chiral terpene, in particular of D/L-Isopulegol. The process comprises: i) a crystallization step to obtain a crystallizate and a mother melt and removal of the mother melt from the crystallizate to afford a mother melt fraction; ii) sweating of the crystallizate obtained in step i) to afford a molten sweating fraction and iii) subsequent melting of the sweated crystallizate to afford a molten crystallizate fraction,
wherein the optical rotation at least of the sweating fraction is determined online using a polarimeter and the changeover from step ii) to step iii) is controlled online by means of at least one control unit.

The present invention relates to a process for the preparation of an optically active carbonyl compound by asymmetric hydrogenation of a prochiral ,-unsaturated carbonyl compound with hydrogen in the presence of at least one optically active transition metal catalyst that is soluble in the reaction mixture and which has rhodium as catalytically active transition metal and a chiral, bidentate bisphosphine ligand, wherein the reaction mixture during the hydrogenation of the prochiral ,-unsaturated carbonyl compound additionally comprises at least one compound of the general formula (I):

##STR00001## in which R.sup.1, R.sup.2: are identical or different and are C.sub.6- to C.sub.10-aryl which is unsubstituted or carries one or more, e.g. 1, 2, 3, 4 or 5, substituents which are selected from C.sub.1- to C.sub.6-alkyl, C.sub.3- to C.sub.6-cycloalkyl, C.sub.6- to C.sub.10-aryl, C.sub.1- to C.sub.6-alkoxy and amino; Z is a group CHR.sup.3R.sup.4 or aryl which is unsubstituted or carries one or more, e.g. 1, 2, 3, 4 or 5, substituents which are selected from C.sub.1- to C.sub.6-alkyl, C.sub.3- to C.sub.6-cycloalkyl, C.sub.6- to C.sub.10-aryl, C.sub.1- to C.sub.6-alkoxy and amino, wherein R.sup.3 and R.sup.4 are as defined in the claims and the description.

The present invention relates to a process for the preparation of an optically active carbonyl compound by asymmetric hydrogenation of a prochiral ,-unsaturated carbonyl compound with hydrogen in the presence of at least one optically active transition metal catalyst that is soluble in the reaction mixture and which has rhodium as catalytically active transition metal and a chiral, bidentate bisphosphine ligand, wherein the reaction mixture during the hydrogenation of the prochiral ,-unsaturated carbonyl compound additionally comprises at least one compound of the general formula (I):

##STR00001## in which R.sup.1, R.sup.2: are identical or different and are C.sub.6- to C.sub.10-aryl which is unsubstituted or carries one or more, e.g. 1, 2, 3, 4 or 5, substituents which are selected from C.sub.1- to C.sub.6-alkyl, C.sub.3- to C.sub.6-cycloalkyl, C.sub.6- to C.sub.10-aryl, C.sub.1- to C.sub.6-alkoxy and amino; Z is a group CHR.sup.3R.sup.4 or aryl which is unsubstituted or carries one or more, e.g. 1, 2, 3, 4 or 5, substituents which are selected from C.sub.1- to C.sub.6-alkyl, C.sub.3- to C.sub.6-cycloalkyl, C.sub.6- to C.sub.10-aryl, C.sub.1- to C.sub.6-alkoxy and amino, wherein R.sup.3 and R.sup.4 are as defined in the claims and the description.